Wally almost made something today. Having a bit of trouble with the Bowden tube - it topped off. Suspect the purple filament needs a lot higher temperature to flow nicely.
I need some decent numbers for Bowden tube E speed and accelerations. I’m using Repetier firmware. Help me internet-kanobi.
Need more info - what stepper, what gear ratio? What sized hobbed bolt / insert are you using? (or, if direct drive, what is your drive diameter)
With accelerations, if in doubt you could try very slowly (500 perhaps) and increase it bit by bit until you find a happy acceleration speed. Adrian Bowyer told me once (I like the way he put it), something along the lines of:
“When you learn to walk, you start crawling, and then you eventually walk - when you challenge it and start to run, the only way to know how fast is ‘too fast’ is to push until you fall over, then you pick yourself up and you know if you go that fast again, you may fall over”
Cool video 
Well… cool bot I mean
Cool printer !!
@Jarred_Baines it’s a 15mm hobbed pulley, standard NEMA 17, 1.8 degree set on 32 microsteps.
@Pieter_Bos It’s designed by @Nicholas_Seward He invents the coolest printers in his spare time after teaching all day.
I notice that you are printing back and to the right. Don’t forget to set the middle of the print to be 0,0
@Alan_McNeil
e_steps_per_mm = (motor_steps_per_rev * driver_microstep) * (big_gear_teeth / small_gear_teeth) / (hob_effective_diameter * pi)
This is taken from Triffid Hunter’s calibration guide and it should give you good starting values, hit me back if you have any troubles… or successes! I’m interested
Triffid Hunter’s Calibration guide:
http://reprap.org/wiki/Triffid_Hunter’s_Calibration_Guide
Got calibrated ok. Moved max speed down to 20 and accelerations down too. See new post for results - it started very nicely.
That’s great
I’ll be following u - Very interesting machine! Excuse my ignorance, did you design it or… What inspired you to make that model?
@Jarred_Baines It’s a @Nicholas_Seward design.
