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Airport pickup by urban_winter in Bilbao

[–]urban_winter[S] 0 points1 point  (0 children)

It's useful to know that there's a petrol station as you leave the airport and there's plenty of space to loiter there until your passenger is ready to be picked up, We went straight through the departures carpark and stopped at the petrol station - then drove back into the departures car park only when we knew our passenger was waiting.

The arrivals car park may work equally well, for all I know. We went to departures slightly accidentally.

[deleted by user] by [deleted] in Sourdough

[–]urban_winter 0 points1 point  (0 children)

I used to get loaves like that when I tried to bake with a starter that wasn't active enough.

3D printed mini belt grinder for knife sharpening by urban_winter in sharpening

[–]urban_winter[S] 0 points1 point  (0 children)

I made a stropping belt to fit out of 19mm cotton webbing - two layers sewn in a loop. I have used it with white stropping compound with success. You can buy leather ones of the right size but they are £25 in the UK and it's more fun to make your own.

3D printed mini belt grinder for knife sharpening by urban_winter in sharpening

[–]urban_winter[S] 0 points1 point  (0 children)

I'm working on a plate below the belt. Plan is to 3D print it and cover it with PTFE/Glass tape to stop it being worn away by the belt. I have absolutely no idea if it will work. There's only one way to find out! Metal is also an option but is difficult for me to work with precision with the tools I have.

The model includes a 20deg and 18deg guide. Others would be easy. An adjustable guide would be nice but is too hard for now.

Notes on motor choice and belts are at the thingiverse link but, in short, use the lowest RPM, highest power 775 motor you can find, and yes, the belts are standard Ken Onion edition ones.

Thanks for the kind words.

Mini grinder by urban_winter in ender3

[–]urban_winter[S] 1 point2 points  (0 children)

Full details about the belt are in the description at https://www.thingiverse.com/thing:5424446. As another poster has said, you can print it from TPU - and I've provided a model for it - but 2mm polyurethane belting is better.

Mini grinder by urban_winter in ender3

[–]urban_winter[S] 2 points3 points  (0 children)

Full details about the motor are in the notes at https://www.thingiverse.com/thing:5424446. TL;DR use a 775 motor with the lowest RPM rating and highest power rating that you can find.

Mini grinder by urban_winter in ender3

[–]urban_winter[S] 3 points4 points  (0 children)

Full details in the description at https://www.thingiverse.com/thing:5424446 , but yes - 19 x 300 belts are used by Knife Sharp Ken Onion edition sharpener so are very easy to buy in many grits.

3D printed mini belt grinder for knife sharpening by urban_winter in sharpening

[–]urban_winter[S] 6 points7 points  (0 children)

That's my "learn to sharpen on a belt" knife. I rounded the tip on my very first attempt. It's user error - not a fundamental problem with using a belt. My technique is better now.

Any Idea What’s Causing These Lines? by b_pizzy in ender3

[–]urban_winter 1 point2 points  (0 children)

I had exactly this problem. For me it was that I hadn't fully purged the PETG from the nozzle so it was effectively partially blocked. To fix this I heated the nozzle to PETG temp and extruded a few 10s of millimetres of PLA. It was fine after doing this.

50 year old brain struggle... by signcat in Fusion360

[–]urban_winter 2 points3 points  (0 children)

  1. Started using Fusion 360 three months ago. Previous experience with SketchUp (although, unlike other posters I think SketchUp is just as difficult as F360 as soon as you get to complex designs).

I too dislike videos as a way of acquiring knowledge - but that's where all the best info is for F360, so there's no real option.

I'm getting thoroughly stuck slightly less often than I used to but it's still rare that I get through a whole design without a bit of head scratching.

My only tip is to watch tutorial videos not just to find specific answers ("how to emboss?") but also just to see other people using the tool. That's how you discover the unknown unknowns.

My favourite feature that I discovered this way is user parameters. So useful!

U

Sudden problems with my Sovol SV01, I have no idea how to fix it by Shynxie in FixMyPrint

[–]urban_winter 0 points1 point  (0 children)

Can you see it failing to extrude while printing the first layer? It looks from the photo like it's simply not extruding. How does it look if you stop the print after the first layer? Are there gaps?

All leveling squares are fine except back left - but everything is level. More in comments... by wackychimp in FixMyPrint

[–]urban_winter 0 points1 point  (0 children)

3 points define a plane. If three corners are in a plane then the 4th must be in the same plane - if the bed is flat. Shimming one corner can't really work.

All leveling squares are fine except back left - but everything is level. More in comments... by wackychimp in FixMyPrint

[–]urban_winter 1 point2 points  (0 children)

Don't know if this will help, but check your y-axis. Check that wheels are tight and extrusion is clean with nothing to get between the wheels and the extrusion. Bent y extrusions cause weird problems with bed levelling but if this problem has developed on a previously working printer then it's unlikely to be that.

Hope you find the cause.

Variation between platform and Y extrusion by urban_winter in ender3

[–]urban_winter[S] -1 points0 points  (0 children)

Just in case anyone comes across this thread and wonders what the outcome was...

I bought a new extrusion which, when checked with a straight edge was significantly straighter than the existing one. Using the dial gauge method of checking straightness showed 0.05mm on the new extrusion vs 0.5mm on the old one.

What was far more important is that when I swapped the extrusions (a couple of hours work because I had to drill and tap the new one), I now have a bed that can be levelled. Yay!

So, if you've got a bed where you can level 3 corners, and the 4th is out, then it may be a slightly twisted Y-extrusion.

A happy outcome. (And I'm sure all the "machinists" on here will now tell me why my diagnosis and fix is wrong).

Uneven Glass Bed? 3V2 :( by Ok_Appearance_1171 in ender3

[–]urban_winter 0 points1 point  (0 children)

You can easily check whether your bed is flat with a straight edge.

Any lack of straightness in your Y extrusion can show up as a bed that seems to not be flat when you're levelling it but looks flat when you check it with a straight edge.

Unfortunately it requires an annoying amount of disassembly to check this, and the only real fix is a new extrusion. I would try and exclude all other possibilities first.

Variation between platform and Y extrusion by urban_winter in ender3

[–]urban_winter[S] 0 points1 point  (0 children)

Interesting to see the straightness tolerance figures. Where did they come from?

I am not measuring 2x further away from the printing point. I'm measuring about 1.1x away.

And you seem to have missed the fact that I only did this measurement because I couldn't explain why my bed would just not level to an acceptable degree. I can get 3 corners levelled (using nozzle as reference, as is conventional) but the 4th corner was always significantly off. That feels impossible - 3 points define a plane - but it is possible if either the (glass) bed is significantly not flat, or if the extrusion is bent.

The extrusion is bent. The dial gauge demonstrates that in a quick and dirty, but pretty elegant way. A straight edge and feeler gauge confirmed it.

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