I’ve re-printed the carriage in PETG and this is no longer an issue. Seems that for SLS the dimensions are smaller across the board. I also noticed that there was no longer a clicking/clipping action when fitting the extruder body onto the bearings. Not sure how that should fit, but in PETG I had no trouble fitting the belt (it was still tight, but went all the way in) and the belt seems more aligned. You are definitely using tighter spaces than the standard Prusa parts as I also printed the MK3 Y belt holder and the belt fit nice and snug into that part without too much effort, guess time will tell if it needs to be tighter! :-)
This screenshot shows a first layer height at .20 and then .15 layer height, is this intended for the test cube? I’m assuming not given there is now graphic arrow next to the change.
Don’t know if it is my SLS print tolerances, but I needed to push my x axis motor back 1.88mm (4 x M3 washers) so that I could align the belt in the middle of the pulley. I did have some trouble with the x carriage too so it could be my belt wasnt aligned at this point. In addition to the washers I also needed 3 x M3x20mnm bolts as the current were too short with the wahsers.
Yes, thank you to the whole team. These instructions are very easy to follow, detailed and complement the fantastic design and work you have done in bringing us the Bear! :-)
Did you prime the bolt and nut beforehand? There is a collapsible support that you need to break so that you can get the full range of clamping. On mine it is fine.
Yes, I did the same. I also had to drill out the 8mm holes a touch as they were a bit small from my SLS print. Probably a good idea to check the fittings of the rods before inserting the bearings so that if you need to drill you dont get debris in the bearings.
I’ve re-printed the carriage in PETG and this is no longer an issue. Seems that for SLS the dimensions are smaller across the board. I also noticed that there was no longer a clicking/clipping action when fitting the extruder body onto the bearings. Not sure how that should fit, but in PETG I had no trouble fitting the belt (it was still tight, but went all the way in) and the belt seems more aligned. You are definitely using tighter spaces than the standard Prusa parts as I also printed the MK3 Y belt holder and the belt fit nice and snug into that part without too much effort, guess time will tell if it needs to be tighter! :-)
This screenshot shows a first layer height at .20 and then .15 layer height, is this intended for the test cube? I’m assuming not given there is now graphic arrow next to the change.
Don’t know if it is my SLS print tolerances, but I needed to push my x axis motor back 1.88mm (4 x M3 washers) so that I could align the belt in the middle of the pulley. I did have some trouble with the x carriage too so it could be my belt wasnt aligned at this point. In addition to the washers I also needed 3 x M3x20mnm bolts as the current were too short with the wahsers.
I tried 12 sheets and mine came up to 1.33mm. Always best to check your thickness, I used three business cards.
Good question, mine are 1mm thick.
Just confirming that this is done without the steel sheet on the bed, just like the Prusa process.
I found that taping the belt end to the end of a zip tie and then feeding the zip tie into the idler helped get it around.
Yes, thank you to the whole team. These instructions are very easy to follow, detailed and complement the fantastic design and work you have done in bringing us the Bear! :-)
Did you prime the bolt and nut beforehand? There is a collapsible support that you need to break so that you can get the full range of clamping. On mine it is fine.
Yes, I did the same. I also had to drill out the 8mm holes a touch as they were a bit small from my SLS print. Probably a good idea to check the fittings of the rods before inserting the bearings so that if you need to drill you dont get debris in the bearings.
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