Final printing problems, parts wont adhere to the hotbed
Comments related to the assembly of the Prusa 3MK2S
I have been designing and assembling electronic and electromechanical devices my entire life. The Prusa 3D printer was truly a beautifully designed device. Mechanically precise with high quality parts and online instructions that were relatively easy to follow. This kit definitely was not a beginners kit. Some level of good mechanical skill was required to understand the principle behind the device as well as the mechanics of construction. All the parts were fabricated with extreme precision with only a few minor mismatches which were easily corrected.
The comments from individuals who were in the process of assembling their scanner were extremely useful in terms of pointing out upcoming pitfalls.
I took my time, made a few easily corrected mistakes and the printer passed all of the final calibration steps.
This is where problems started. I have spent more time trying to get my first print that it took to assemble the kit. I still have not mastered the technique of getting the filament to stick to the print bed long enough to begin to develop the printed figure. I have done scrupulous cleaning with alcohol, and used the supplied glue stick to no avail.
I have run the the V2calibration.gcode endless times trying to achieve the perfect shape of the line on the print surface. I have adjusted the live adjust Z axis from positive values to greater than -1 mm. I have reset the PINDA sensor multiple times, both greater and less than the thickness of the recommended tie wrap. If the space between the nozzle and the bed is too small the nozzle will quickly snag on the printed part pulling it off the bed. If the space is too great then the filament will not adhere to the preceding layer and a massive tangle ensues.
My understanding is that the first layer should be moderately flat to give a sufficient surface for adhesion to the hotbed. The handbook mentions the Brim option in Silic3r, which remains a mystery [I cannot find this option].
When everything appears to be properly set the first few layers seem to be deposited perfectly.
Inevitably many minutes into the printing process the nozzle will snag on a piece of filament and a tangle is created that ultimately either pulls the part off of the print bed or just turns into a mass of hot PLA under the nozzle dragging back and forth across the part.
Have I missed something obvious either in the assembly or during calibration?
Is this a good question?