Thanks for the video, it saves our time to guess what could be wrong (tu)
Richrap provided two kind of carriage, one for LMU and one for bushing. I printed the one for bushing but soon I saw there is a little problem with it. It doesn t fit good and because Richrap didn t build a 3DR with bushing at that time, I thought this part is untested and is a beta. So I took the seconde one for LMU. As far as I can see, you also took this seconde carriage. So I don t see any big potential for failure here, just a small correction in your firmware:
Instead of guessing, you could replace some parts one by one until you discover which one was faulty. I mean:
1. Measure the diameter of the plastic spool you have printed and check if they are identical. Then update your firmware with this information. The firmware is calculating the steps value based on this diameter. If it is wrong, the steps are wrong. If they are not all the same, guess what could happen.
2. Eleminate these printed joints. Make it simple, take a 4 mm threaded rod (1$/m), cut and screw them into Traxxas Rod Ends 5347 (12 / $6.95). You don t need anything else. Use a jig to be sure they are all the same length. The carriage and the effector you are using have 2 mm holes, either you enlarge the hole (as I did) or change it in CAD and print new one. I know, carbon rods are lighter and allows higher speeds, but I think at this stage you are looking for a working printer.
3. If the above didn t help, replace the spectra line with GT2 Belts and pulley. The alu spool for spectra is an option but for me not the best.
Good luck!
Richrap provided two kind of carriage, one for LMU and one for bushing. I printed the one for bushing but soon I saw there is a little problem with it. It doesn t fit good and because Richrap didn t build a 3DR with bushing at that time, I thought this part is untested and is a beta. So I took the seconde one for LMU. As far as I can see, you also took this seconde carriage. So I don t see any big potential for failure here, just a small correction in your firmware:
// Horizontal offset of the universal joints on the carriages. (This is measured from the edge of the M6mm Rod to the cent of universal joint, 14mm on Mini Delta (3DR) #define DELTA_CARRIAGE_OFFSET 14.0 // mm // Was 25.0 // mm This you may need to change if you are using a different linear bearing / rod size / bushing / or a modified carriage design. If not, 14.0mm should be correct for 3DR using normal carriages and LU6UU bearings.code source
Instead of guessing, you could replace some parts one by one until you discover which one was faulty. I mean:
1. Measure the diameter of the plastic spool you have printed and check if they are identical. Then update your firmware with this information. The firmware is calculating the steps value based on this diameter. If it is wrong, the steps are wrong. If they are not all the same, guess what could happen.
2. Eleminate these printed joints. Make it simple, take a 4 mm threaded rod (1$/m), cut and screw them into Traxxas Rod Ends 5347 (12 / $6.95). You don t need anything else. Use a jig to be sure they are all the same length. The carriage and the effector you are using have 2 mm holes, either you enlarge the hole (as I did) or change it in CAD and print new one. I know, carbon rods are lighter and allows higher speeds, but I think at this stage you are looking for a working printer.
3. If the above didn t help, replace the spectra line with GT2 Belts and pulley. The alu spool for spectra is an option but for me not the best.
Good luck!