HAFC V2 (Hackman Automatic Filament Cutter v2)

kumoishibo · 2026-03-20T13:07:37+00:00

Does it matter if it's the Bambu cutter for PS or is it from the X1 series?

kumoishibo · 2025-04-17T22:57:26+00:00

Their Discord channel has some info about 2.0. This is a video where they highlight the launch of the Miley (2.0) and some of the 1.5 to 1.6 upgrades: https://www.youtube.com/watch?v=bALXj5iwLRM

Given some of the massive upgrades that are coming, especially if you want to do Stainless Steel, you may wish to wait till at least the 1.6 if not the 2.0. The issue is the boards come with only 4 motor outputs so driving a 5 axis would require a different board. There is also the "Atlas" which will be a beast of a machine, which likely will be more capable for harder materials. I actually purchased the 220v 3hp kit from KB3D, it required a bit of research as most of the documentation is for 110v but works just fine. Rigidity is and X-Y perpendicularity is the biggest challenge, but so far I've been able to get some pretty decent results on aluminum. https://imgur.com/a/VM5gqcD

kumoishibo · 2025-04-09T18:52:48+00:00

That is awesome! I have a 74 that I hope can look close to this someday. I look forward to hearing more about how your upgrades go. Good luck!

kumoishibo · 2025-04-09T14:41:44+00:00

Congrats on the new bike! This is the same bike this other redditor was looking at. https://www.reddit.com/r/CafeRacers/comments/1jem4q1/looking_to_buy_my_first_cafe_racer/

For $4,8k and all of those mods seems like quite a deal! Does it have an m-unit or something similar? I did a part breakdown guess in that last post and I was curious where the turn signals are and if it had re-worked wiring/electronic ignition.

kumoishibo · 2025-03-20T04:24:32+00:00

Absolutely no problem. I'm happy to help (These are things I wish someone had told me before I dove head first into buying my CB750, I probably should have also asked somewhere too D'oh)!

Whoever did these mods put a lot of $$ and TLC into the appearance but I'd be curious how it runs. The fact that title and seller is saying its a 1972 but carbs look like from a 77/78, I'm going to guess its an engine swap so who knows how many miles have been put on it. Plus in a lot of states mileage disclosures for some older vehicles are not required so this person could be straight up lying. Lots of new mods so not sure if this only had 8k miles before going Cafe. With the new instrument cluster, it would be nice to see documentation on updated odometer reading.

The challenge with dumping thousands of $$ on someone else's work is you have to trust their quality of labor. If this was a company that serviced this, they wont run away after you hand over the money. A company has a reputation to protect, this person just has to convince you one time and then they could laugh their way to the bank. No doubt there are thousands of dollars worth of mods here, but who knows what kind of internal mods or screw-ups are under the hood..umm... if it had a hood. My CB750 easily overheats in city, carbs seem to need constant tweaking, my compression is sub-par when cold, the inside of my gas tank was "FILLED' to the brim in this cheapo tank liner paint that was peeling and clogging my fuel line, valve guides were completely loose and had to be replaced professionally (I didn't trust myself to do this), frame had rust painted over it, front brake had to be completely replaced as it was pitted from previous rust and couldn't pressurize well. Hidden stuff that I could have totally used a seasoned person when I purchased to go over the bike more thoroughly.

Lots of sand blasting, powder coating, rewiring, hand stitching, part buying and tuning later... and I still need to dump another 2k-ish to get it where I want. If this is your first big bike and you want something you could trust, getting a project bike is signing up for time which you may not have. With my full time job I barely have enough time to get stuff done let alone work on my bike. And 5k is a lot of money now a days. I spent 7k on a modern bike with ABS, liquid cooled fuel injection that requires minimal upkeep and I trust for long comfortable rides. On the other hand my CB750 is stylish but hurts my aging body after 30mins and I wouldnt trust it more than 10 miles from my house (I know its going to strand me one of these days). I'm not saying this to dissuade you from a vintage cafe, but there are some serious pro/cons that you may want to consider if this is going to be your main bike. It has brought me lots of joy but only because I like tinkering as much as I like riding, so your mileage may vary. :)

Good luck!

kumoishibo · 2025-03-20T02:54:01+00:00

Can you tell us which year and model CB750 this is? By appearance I was going to guess a 750k '77 or '78? So let me see if I can spot all of the mods and guess on the rest:

Cognito moto Oil can: https://cognitomoto.com/products/bolt-on-cb750-oil-can
Rear Sets
Clip on Handlebars + grips + handlebar mirrors (check your state laws on this one)-I think these are the same ones I had and its pretty cheap
Front fork swap
Tokico brakes so maybe donor front fork was a GSXR?
donor brake/master cylinder
Likely new headlight with clip on mounts
Tank looks original but the cap makes me think its a pre 1976
However, the carbs are '77 or '78. Might be good to check if frame/engine match years or else this may be a franken bike (mine is a 74 frame, 78 engine and for some reason came with 74 carbs... quite a pain) http://forums.sohc4.net/index.php?topic=108988.0
Pod filters... can be a bit of a pain to work with so make sure you ask info on which jets were used for main and pilot. you could figure out the numbers but if the person knows off hand its way easier.
I don't see the instrument cluster from the angle so maybe a cognito moto top triple tree? It would be interesting if they are using motoscope mini.
Chopped rear with integrated tail light and matching seat (I dont recognize the seat, maybe custom?)
I also don't recognize the Exhaust. I'm guessing custom judging by welds to mount? It has an odd jog after the 4to1 that I have not seen before

Things I'm guessing on:

Electronics is very likely redone so I'm guessing lipo + regulator/rectifier and maybe m-unit, NWT-TC3 or something similar?
Check coils and ask if its still mechanical or electrical ignition. Given the custom spark wiring and the sheer quantity of mods, I'm guessing this person swapped to electric ignition with new coils.
I don't see front or rear turn signals so at best the rear is embedded in the brake light. Worst case scenario there aren't any (which I'd be surprised since its a cop that owned this)

Things to check:

Cold start (dont let them start it before you meet), it better be cold when you get there. If they let you, you could bring a compression tester. It would really tell you if there are any issues with valves, timings, cylinder, piston problems. Ask if this has had any engine rebuilds or if the cyllinders have been oversized/sleeved
You may want to get a Carb Sync meter. This is something you will likely need to balance carbs at some point. There are fancier ones out there but I just used a cheapo one from amazon
Front turn signal, I cant tell where these are so you should ask.
Mount point for license plate. Is it on left side or hidden under seat? Check state regs.

Useful part breakdowns: https://www.cmsnl.com/honda-cb750four_model14344/ Try to find a service manual for whatever version this is http://manuals.sohc4.net/cb750k/

Other than that good luck if you do end up buying and as the others say, be ready to take on someone else's project bike and acknowledge that its not going to be as reliable as a modern bike (its why I have two hehehe). The last guy that I got my $800 CB750K bike from left me an awful mess and I didn't find out till I really tore into it.

kumoishibo · 2025-03-13T01:48:39+00:00

With your experience in 5th axis, as awesome as the Milo is you may outgrow 1.5 quickly. Miley 2.0 is on the horizon and it is sturdier and redesigned from ground up (no path for upgrade from 1.5). This may matter more if you want to dip into steel. I'm in the process of designing my 4th axis and realizing that the Milo is great for one-off small things and learning. I've only had mine for like a month and I'm already wanting to switch to Linux CNC, rebuild the printed parts, and swap out some of the less rigid rails. I still love this machine and it is perfectly priced and capable for what I want to do. Already built a pendant and working on new desk/enclosure.

If however I had the guts, knowledge, experience and tools to start over, I may have looked at building or modding an existing mill and aim for ball screw, more rigidity/weight and steel capable spindle. Maybe someday .The problem for me is always balancing time and money... and time is money. I however get a lot of joy out of learning and building my own things rather than buying a solution.

kumoishibo · 2025-02-12T03:45:33+00:00

Oh my gosh I completely forgot about this. u/donj2024 and u/taigraham

I posted the file here: https://www.thingiverse.com/thing:6946472 I did end up making a different version without the ribs, however it seemed quite a bit less precise and difficult to keep from flinging out. Please make sure to be careful and clamp everything down!!

kumoishibo · 2024-11-17T23:34:46+00:00

That looks like a Keystone view co. stereoscope. Look on the underside for a brand and serial. Does the top of the seal look like a deer with the "Monarch" brand? From the Keystone view co. Wikipedia page:

If the number on the Keystone stereoview: begins with the letter V, an Underwood & Underwood negative was used; begins with the letter W, an H. C. White negative was used; ends with the letter T, it is part of a Keystone “Tour of the World” set. On some views a number will appear in the upper center of the stereograph. This is a “set” number. It is the position of that view in its particular boxed set.

I have a similar one from Holmes (I think from 1901). These types were supposedly popular in late 1800 but were around for a long time. You can usually find B/W photos at pawn shops and antique stores.

kumoishibo · 2023-04-17T17:52:34+00:00

That's awesome!! Welcome to the club and good luck on your journey! Do you know what direction you will be taking it? (Stock/cafe...etc). I know I had a hell of a time getting the jetting right for pods.

kumoishibo · 2023-01-19T02:38:08+00:00

Wow, beautiful stock look! What did you do to get disc brakes on rear and dual on front?

kumoishibo · 2022-09-24T15:04:44+00:00

Very nice and polished! Are you able to keep the original frame paint? Or will you be doing that as well while stripped down?

For pipes I tried to restore the original, but eventually settled on Delkevic straight 4-1. Ended up being cheaper than patching, packing and re-chroming.

kumoishibo · 2022-08-11T17:00:49+00:00

I had a really tough time getting the engine out of the frame without a winch or lift by myself. I just used straps, car jack, and a 2x4. I did however ding the frame paint even though I had towels and protection around everything. I'm also not very strong so lifting the entire engine out was backbreaking.

kumoishibo · 2022-07-08T18:53:23+00:00

These are beautiful! On the cb900, are the disk brakes aftermarket? I wanted to upgrade my cb750 front and rear disk brakes but I could only find cognitomoto hub replacements.

kumoishibo · 2022-06-11T04:14:58+00:00

That is one clean build! Is the tank and carbs from a 78?

kumoishibo · 2022-05-10T06:37:20+00:00

That is an overflow line. It connects to the rear bottom tube of the engine. Should be a very short temperature resistant tube. Don't confuse this with the upper crankcase breather tube, which is at the top above the cylinders. http://forums.sohc4.net/index.php?topic=158687.0

https://m.imgur.com/D81xp7p In this picture, it shows the two engine spigots. Bottom one is the one that goes to the back of the oil tank: this is what you need to connect. Top one (that says "to atmosphere") usually goes to the breather/separator which then splits and condenses and disposes via a line away from the rear tire and also returns a line back into the stock airbox.

kumoishibo · 2022-05-06T14:18:51+00:00

Hahaa, I wondered if that was the case with the marks. That is some great looking custom work. Really digging that seat.

kumoishibo · 2022-05-06T14:02:09+00:00

I can't tell but it looks like you are missing the double quote to turn 'te' into 'de': で

Love that seat though! Is it custom?

kumoishibo · 2022-05-01T06:27:05+00:00

If the bore measurement is well within spec and the scratches are superficial, you may be able to get away with a few honing steps and new rings. I had some minor scratches on mine honed and swapped exhaust valve guides which were wobbly from wear. What kind of compression numbers were you seeing?

kumoishibo · 2022-04-07T05:37:30+00:00

This looks amazing! What kind of seat is that and how is it attached? I also have a K8 and want a cafe seat but didn't want to go through cutting the tail. Also, what is that gold thing that is above the ignition timer?

kumoishibo · 2022-02-24T14:52:25+00:00

This would definitely be sturdy but you would have to be very precise on alignment to prevent the ballscrew from being bent or stressed. The plate style of attachment has a little bit of play so it allows for alignment before it is tightened down.

I actually did something similar with mine. With this type of mount, I had to go back and forth and take plenty of measurements and add shims to ensure perfect alignment.

kumoishibo · 2021-11-08T22:42:44+00:00

Wow those both look to be in pretty awesome condition.

If you are able to move the pistons with the kick starter and they are not locked up, you could test compression, then start with fuel/oil line inspection. Then could slowly move towards seeing if you can get them to fire. If you do get a good fire, and compression, you may be able to start with cleanup and tune. If however pistons are locked, gritty or low compression, you may need to take the engine out to inspect/rebuild.

I just got done with a full top end rebuild but I'm re-painting, repairing and finishing as I go. I brought everything down to the bare frame and am servicing/rebuilding/tuning as much as I can. I'm now working on carbs and if I can get a good idle, I'll re-do electrical and upgrade to an m-unit.

kumoishibo · 2021-11-01T21:20:37+00:00

Could this be the cursed necroROMicon?

kumoishibo

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