Printer fials to extrude filament when printing a raft

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Joined: Mon Feb 27, 2017 6:17 pm

Printer fials to extrude filament when printing a raft

Post by matthewrblack » Mon Feb 27, 2017 6:21 pm

A recent problem our UP Box has developed is that it will stop extruding filament when it is printing a raft . Being a teacher at coursework hand in time, this is causing some stress. We are using genuine UP black ABS filament. When the raft is switched off the part prints fine though it struggles to remain attached to the bed.

Thanks in advance


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Joined: Tue Jan 24, 2017 11:38 pm

Re: Printer fials to extrude filament when printing a raft

Post by LovelyTwo » Fri Mar 03, 2017 1:00 am

Just guessing, but I can think of a few possible causes for this failure while printing a raft, and not during non raft printing.

- The distance between nozzle and build plate is too close. (or non-levelled build platform, check clearance by method outlined in manual folded paper)
When printing a raft especially on perf board, the up software vastly over extrudes to force melted plastic into holes. When the distance between the nozzle is too close it can cause back pressure in the nozzle which allows the extruder motor to slip, and once it slips a bit, it tends to continue slipping.

- Trying to print on smooth build platform, while having the software set to print on perfboard.
Like above: the over extruded plastic has no holes to fill which may caused increased back pressure.

- A Filament feeding problem, eg friction on spool, friction in feed tube, out of tolerance filament (too thin)
Since the raft requires a higher extrusion rate, the machine needs to be able to pull filament in quicker. Try a difference filament, or try unrolling a few turns of filament before printing, allowing them to sit loosely on the roll and see if this helps.

Hope this helps.

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Joined: Wed May 17, 2017 11:27 pm

Re: Printer fials to extrude filament when printing a raft

Post by ksprint » Tue Jun 13, 2017 7:30 am

Stage too high, blocking the nozzle and clog it.

The UPBOX's auto calibration gives owner false sense of security that everything is fine. It can sort of zero out stage flatness but there is a limit how much it can compensate. For me, I always do manual stage calibration if stage height values differ by more than 200um after auto calibration.

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