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| picclock:
@pete49 I have found that bed temperature and adhesion is a real issue, especially for larger prints. The problem seems to be that the surface temperature varies widely over the glass. I put a 1mm sheet of Aluminium between the glass and the pcb heater and found this to improve things considerably. For adhesion with ABS i have found hairspray coated with ABS juice works well with the parts removing easily when cold (260C extruder, 100C bed). I have only made a few parts from PLA, and I used the blue masking tape that Joules shows in his picture. @ Joules Good calibration square. I have a calibration problem in that everything I print comes out ~0.14mm larger than it should. The error is constant regardless of length, and is in both directions - not Z. I am using the Cura slicer and wonder if that might be the issue. Have done tests altering the extrusion rate but its not made much difference, just produced poorer parts. Anyway, don't want to hijack Pete's thread, so will be updating my project log hopefully today. Best Regards pcclock |
| Joules:
pcclock I would say you are pretty near your limit at 0.14mm error. I settle for 0.1mm per 50mm of length. Too many factors come into play at that scale, note your error and scale design to compensate. However before you do that, what layer height did you print, what nozzle size, that tolerance will change from filament to filament and also colour and how long the filament has been exposed to atmosphere. My single walled cube above has another error. Note the ring and the base, the ring is very rounded and the corners of the cube lift from the surface, my initial Z start is also wrong. The single wall allows you to measure the true output thickness of your nozzle. This would most likely account for up to half your 0.14mm error. Check it against the calculated wall thickness or extrusion size in Cura. |
| Joules:
As it's relevant to Pete's issue I post an image of the cubes I used to tune one of the Mini Kossel printers, they are numbered in sequence, the Z issue was resolved by number 2, number 4 had an issue with over extrusion during a hard turn and resulted in some blobs down the edge. A tweak to slow extrusion on deceleration, or direction change solved that, depends what your software allows to be tweaked. Second picture looking into the cubes so you can see the bottom layer, they are numbered 5-1 left to right. |
| Pete49:
Thanks Joules I'll give it a go. I'm using PLA as it came with it but am getting another nozzle for ABS. picklock I use hairspray for ABS with the xyz printer and it works well even on big prints with no lifting so assumed it will work with this printer once I get it running right. Once I get it right I intend to make a enclosure for it as I have a sheet of plexiglass sitting in the way :ddb: Thanks again and I'll be back Pete |
| Pete49:
well here's last nights attempts as requested. I got a reply from the supplier of the kit and suggested floor temps between 60-70C and I found 64C was the temp when it stuck but well the pics explain it all. I'm about to check the feeder in case that is the cause as it seems to be lacking filament output in my view but open to correction. The glass supplied is borosilicate so handles higher temps no problem....a small win there. Once this is running right I am going to re-engineer the unit and make it less flexible though its not too bad I think I can improve on it a little. I have been given a sink cut out about 1.5 inches thick which I will make my base from and with aluminium angle and Perspex for the enclosure it should be solid enough. Pete |
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