Test case for 28BYJ-48 drive: Bowden for Re-D-Bot

thingiverse

I purchased these motors [here][1]\r\n[1]: http://buyeasy.by/cashback/view/pn1agmnckf5ou2ovc7sff5mf7co13wuw/?to=https%3A%2F%2Fru.aliexpress.com%2Fitem%2F28BYJ-48-DC-5-4%2F32944937475.html%3Fcv%3D0%26af%3D208%26aff_platform%3Ddefault%26cpt%3D1550345755924%26afref%3D%26sk%3DccfBY4yg%26aff_trace_key%3D4fdaee87e50f4687b3162fbe80cddb2b-1550345755924-08068-ccfBY4yg%26cn%3D43pn1afvcu8xw7slbxvqe22neqn9eu5u%26dp%3Dv5_43pn1afvcu8xw7slbxvqe22neqn9eu5u%26terminal_id%3Dec3e41dde24d481189b945da6ac8c158\r\n\r\nThe 28BYJ-48 must be replaced with bipolar\r\nhttps://hackaday.com/2014/07/29/changing-unipolar-steppers-to-bipolar/\r\n\r\nApproximated Bill of Materials\r\n- Spring for Ultimaker hotbed\r\n- MK8 gear\r\n- 3pcs 623zz bearings\r\n- 28BYJ-48 5V stepper drive\r\n- PC4-M6\r\n- PTFE tube\r\n- M3 nuts, screws, and washers\r\n\r\nMarlin settings:\r\nDEFAULT_MAX_FEEDRATE { 150, 150, 4, 80 }\r\nDEFAULT_MAX_ACCELERATION { 3000, 3000, 100, 100 }\r\nDEFAULT_ACCELERATION 3000\r\nDEFAULT_RETRACT_ACCELERATION 100\r\nDEFAULT_TRAVEL_ACCELERATION 3000\r\nDEFAULT_EJERK 3.0