www.jetpens.com/blog/The-Bes...
Not affiliated with jetpens but have bought from them before and had a good experience.
Also consider wet erase markers if you don’t do a lot of erasing on the spot, and you want to avoid the sticky dry erase “dust”
www.jetpens.com/blog/The-Bes...
Not affiliated with jetpens but have bought from them before and had a good experience.
Also consider wet erase markers if you don’t do a lot of erasing on the spot, and you want to avoid the sticky dry erase “dust”
youtu.be/cWUCD_ZtlLA?...
youtu.be/cWUCD_ZtlLA?...
Much trigonometry in the control…
Much trigonometry in the control…
A spool of red plastic filament in a clear tube, the motor spools out/reels in the filament to adjust the height.
A belt on two pulleys, one at the top and bottom. The outside of the belt is painted partly red the other white.
A spool of red plastic filament in a clear tube, the motor spools out/reels in the filament to adjust the height.
A belt on two pulleys, one at the top and bottom. The outside of the belt is painted partly red the other white.