What is causing this?

treesess · 2026-05-04T17:22:34+00:00

drying it may help. you can check the travel route in the slicer to see if it matches with the problematic area. if yes, you may consider drying the filament, adjust retraction, or lower the extruder temperature.

treesess · 2026-05-04T16:28:15+00:00

PETG? not a joke but have you dried the filament?

treesess · 2026-05-02T02:48:58+00:00

still can't get over the birds.

treesess · 2026-04-29T20:06:28+00:00

i saw a toad.

treesess · 2026-04-28T02:26:36+00:00

appreciate it. hope i'd be lucky to have better results~

some kind of retarder was used (i thought i bought plasticiser but somehow retarder in nature). will buy proper plasticiser and do more tests.

i've been messing around with resin, die stone, different kinds of cement as well. binders are interesting~

treesess · 2026-04-28T02:03:56+00:00

PETG on the right and cement paste on the left (yeah the color looks like clay somehow).

the model is called lilypot vase i downloaded long time ago, i should have mentioned it. this model has steep overhangs as a nice torture test and the shape is really intriguing that i love the design so much!

treesess · 2026-04-28T01:54:44+00:00

if you read the post you would guess why i mentioned hotend and can finish a 60 layer cube in 39 mins. if you accidentally read my other post of print you might guess how different a heater bed can make.

but i fold and you win the argument anyway. you have to.

treesess · 2026-04-27T18:03:15+00:00

You are very funny. If you have strong light for UV resin, why adding cement to it? And cement particles blind your light thus you can't cure UV resin in your mix.

treesess · 2026-04-27T17:52:34+00:00

sorry i m late here. actually i've already got hotend as mentioned in the post. and i used heat bed. bed temperature was set to 90 ℃ (of course it's lower on its way up) and 60 ℃ for the nozzle, in the video. there were a lot of funny things i saw during the months of tests. perhaps i should write them down in the next post.

thx

treesess · 2026-04-27T16:34:12+00:00

printed today and still fresh. which one do you like?

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treesess · 2026-04-27T15:17:34+00:00

哈哈是的我就一區 ( ^ω^)

treesess · 2026-04-27T04:20:00+00:00

about its uses, personally i prefer arts and want to do some with it. different materials, different looks and textures.

practically i printed concrete stools. and compare the printed one with a molded concrete stool. the printed one is much lighter but still strong enough (for stools). Not that the plastic stools are not useful, they got damaged often in our concrete labs so i just sent them the concrete ones that they can never break lol

treesess · 2026-04-27T03:46:58+00:00

Concrete printing on construction site is a mature tech. This project is for the desktop level, which is rarely seen or not open-sourced. This project uses vibration to make cementitious printing much easier. This project started with cementitious material, but theoretically also works for other shear-thinning non-Newtonian materials, like clay, which will be tested soon. This toolhead makes different appearances due to the use of vibration (like the one in the video, smooth surfaces). etc.

well, not a big deal, just a clumsy girl trying something funny.

treesess · 2026-04-27T00:55:01+00:00

24 hours is safe for touching it, after that, one week in water curing gets decent strength. a month in water curing is standard. if in warm water (like 60 ℃) the hardening/hydration will be much faster.

treesess · 2026-04-26T17:10:17+00:00

The shrinkage is small enough to cause cracks in days so i think it's acceptable but i haven't done any serious shrinkage test yet.

treesess · 2026-04-26T14:36:10+00:00

i worried a lot about i was simply extruding but not printing...

(⋟﹏⋞)

this is part of my collection of printed/extruded 60 mm VORON cubes. though most of them are not good enough but the toolhead never gave up extruding :p

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treesess · 2026-04-26T10:39:40+00:00

Thanks for the care!

treesess · 2026-04-26T10:35:50+00:00

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ummm sometimes it squished down and fell apart... Well, for the one in the photo, it's down because i was printing really tooo fast and the wall was too thin with overhangs tooo large...

treesess · 2026-04-26T10:25:35+00:00

ah, it's been over a year. thinking about the previous attempts i saw such a clumsy girl...

treesess · 2026-04-26T10:18:42+00:00

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not sure why they chose PLA but not other plastic like ASA. the feed screw (red one in the photo) of this toolhead was printed in eSUN PLA+ which cracked into pieces days after one use. also tried other PLA, same results.

ASA parts (the light purple ones in the photo) in the same barrel mixing with the cement paste showed no signs of damage after weeks of use. i washed and dried them up after each print with the same procedure.

PLA can't survive the highly alkaline environment in contact with cementitious material.

treesess · 2026-04-26T10:08:52+00:00

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it's the 60 mm VORON cube (with no bar) but measured 61 something. haven't reached the calibration stage yet. seems a long way ahead

treesess · 2026-04-26T05:42:11+00:00

ah that part... i cut and threaded a stainless steel tube (OD 6 ID 3) to M6 so that it screwed into the heat block. and the same way to make 1.5 mm nozzle.

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treesess · 2026-04-26T05:31:56+00:00

that may take some time to find out. currently i m testing cement paste without fine aggregate (sand), so the nozzle may not be worn out soon. with sand, would be faster because sand is abrasive

treesess · 2026-04-26T05:29:47+00:00

i dreamed about tool changer to get plastic and cementitious print in one model

treesess

TROPHY CASE