Ender 5 - Z Axis Counter Weight
Description
After adding a glass plate onto my Ender 5 build plate the bed would drop when the power was turned off. I hesitated to shim the spring that prevents this from happening as I felt it would put more strain and wear on the Z axis stepper motor and related parts. Although the counter weight adds some inertia to be over come in the Z axis, there is so little movement in the Z axis on an Ender 5 during printing that the consequence of the added inertia should be negligible. This design uses a lead filled shell as the weight. I place about 1.4 lbs of lead in the shell which compensates for a 1 pound glass plate and a little extra for part of the build plate assembly and printed item weight. Besides the printed parts eight #8x ¾” bolts and nuts, four #6x8” flat head screws, two 608RS 8 x 22 x 7 mm Deep Groove Ball Bearings, a length of high strength (I had some 70lbs test) braided fishing line, and a paper clip are need. Tips: The holes for the Pulley Pins can be reamed with a 5/16” drill bit to make insertion of pulley axle pins easier. A paper clip can be used to make cotter pins to retain the pulley axle pin. The short leg of the Z Bar fits into the Build Plate Clip with the Z Bar facing down. The short legs of the Build Plate Clip go on the top of the build plate support, around the threaded Z axis rod. The long legs of the Build Plate Clip go under the build plate support and clip onto the support when fully pushed into place. When installing the string and weight, attach the string to the Z Bar on the build plate clip then move the build plate to the lowest position. Thread the string through the pulleys and tie the weight as close to the side pulley as possible to assure full vertical range of motion for the build plate and weight.
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