{"product_id":"mini-ratchet-wrench","title":"Mini Ratchet Wrench","description":"\u003cp\u003eThis miniature ratchet wrench is ideal when working with limited access. This one works differently than a lot of the other 3D printed ratchet wrenches that have appeared over the years. Almost all the typical ones have the entire torque loaded onto a tooth or two of the rachet. This one actually acts a little more like a strap wrench, where the torque load tightens the outer ring onto the ratchet, creating a self tightening friction wrench. Hence, all the load is not taken up by the ratchet tooth alone. The interior ratchet is firmly locked into place as you exert a torque. To switch the direction of the ratchet, just flip the wrench over.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eI've provided 2 different versions: The first has a standard 3\/8\" square drive for use with standard sockets. The second has a ¼\" hex hole for standard hex shaft bits.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003ci\u003e\u003cstrong\u003eUpdate (7\/20\/2024)\u003c\/strong\u003e\u003c\/i\u003e\u003cstrong\u003e:\u003c\/strong\u003e I've added \u003cu\u003efinger knobs\u003c\/u\u003e that can slide over the back of the square post (socket model) or the end of your hex bit (¼\" hex bit model) that allow you to turn the bit\/socket with your fingers, or allow you to hold the bit\/socket steady for the ratchet backswing.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eI strongly recommend printing this in PLA-CF, as this material will be much harder and stiffer than standard PLA (or other un-filled filaments). Note, though, that you need a high quality CF filament like Bambu's PLA-CF. Many cheaper CF filaments use, essentially, carbon fiber dust rather than actual fibers, resulting in parts that are both \u003ci\u003eweaker \u003c\/i\u003eand \u003ci\u003eless \u003c\/i\u003estiff than standard PLA.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eTo retain the socket for the 3\/8\" square drive, a couple of small length of soft TPU filament are inserted into the pairs of holes in either end of the square shaft. This forms a little rubber bump on one side to hold the socket in place. Cut the filament ends off flush on the other side of the square shaft.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eTo retain the ¼\" het bit, there is a small pocket in one of the faces of the hexagonal hole. Take a 5mm long piece of soft TPU filament and press it into this pocket. The filament forms a small rubber bump to hold the bit in place. (Note: the hex shaft finger knob also has the same pocket for adding a bit of TPU filament.)\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThe ¼\" hex tool prints in place with no additional assembly required (except for the TPU piece above). The 3\/8\" square tool has the square shaft printed as a separate piece. It gets shoved into the square hole in the ratchet. The square shaft has a slight taper, so you need to tap the shaft in place to get a good friction fit.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eDesign by LoboCNC on MakerWorld (license: BY-SA).\u003c\/p\u003e","brand":"Mymadmanlab","offers":[{"title":"Default Title","offer_id":67367859388720,"sku":null,"price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0987\/0809\/5280\/files\/0_1c78a252-721e-48c6-941a-761fdb308793.png?v=1784017607","url":"https:\/\/mymadmanlab.com\/products\/mini-ratchet-wrench","provider":"Mymadmanlab.com","version":"1.0","type":"link"}