RobotDigg want your answers on the following two questions:
1. Prusa i3 rework, do you really need a 300mm Tr5*2 lead screw threaded Nema17 stepper motor?
2. Do it matter an odd number of teeth or an even number of teeth of a timing pulley?
We are glad to have your answers on these, please email to sales@robotdigg.com to win COUPON
Answers who win:
5mm screws are nice because they are considerably less stiff than the 8mm lead screw used for the z axis. So z wobble caused by any screw issues won't show as much. If you can promise perfectly straight 8mm screws they would likely be fine, but any irregularities in the screw will likely show in the print.
RobotDigg provide a precise stiff Tr8*2 320mm lead screw stepper for Prusa i3 rework.
For almost all 3D printers, it does not matter if the pulley has even or odd number of teeth.
Reason: The pulley is not being used like a gear - the teeth are for friction only. This is why some designs have used fishing line instead of belts and pulleys.
The important part of of the pulley is its pitch diameter (not shown on your website), the larger the diameter the less resolution will be available as the belt will travel farther for each step of the stepper motor
Example: Assuming a 1.8 deg stepper motor at full step
16 tooth GT2 pulley - pitch diameter is 10.19mm the belt will travel 0.05095mm
20 tooth GT2 pulley - pitch diameter is 12.73mm, the belt will travel 0.06365mm or 25% more per step
If the pulley is driving another pulley then the number of teeth matter as it is the ratio between the 2 pulleys - and some combinations will not give ratios that are friendly for calculating position (ie on turntable that you want to turn in even increments of degrees)
