A 5 axis robot arm controlled by an raspberry pi. I used 6 servos to move the robotarm. We controlled the robotarm by a motioncontroller glove we developed: https://www.thingiverse.com/thing:4821552

inverse kinematik software robotarm: https://github.com/GitInVisualStudio/roboarm

garbber: stls https://www.thingiverse.com/thing:2415

PCB:https://drive.google.com/file/d/10WSPIAV2YotayWVrlmb9fE7hsa2IlNgg/view

What do you need:

20kg servo https://www.amazon.de/gp/product/B01MU78A29/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

3 weak servos: https://www.amazon.de/AZDelivery-Digital-Roboter-Hubschrauber-Flugzeug/dp/B07PXDKLGH/ref=sr_1_14?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=5v+servo&qid=1617908623&sr=8-14

2 even weaker servos: https://www.amazon.de/AZDelivery-%E2%AD%90%E2%AD%90%E2%AD%90%E2%AD%90%E2%AD%90-Roboter-Hubchrauber-Flugzeug/dp/B07CYZK379/ref=sr_1_5?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=5v+servo&qid=1617911417&sr=8-5