My new E3D hot end clone turned up the other day for my Mini Kossel, this cost £7.49 ($11.60) with free P&P from ebay seller digital_store_2014.
Based on the issues I had in the early days with my Prusa I3 printer and having to manually turn a spool of filament, I decided to get ahead of the game this time and print a spool holder.
I particularly like the look of this minimalist spool mount and guide on Thingiverse
As there are really only 2 different items to print, I need 3 of one of them and they are all pretty small, I decided to print them all at once.
To make them up required 6 x 625 bearings, 5 x M5x20mm screws, 3 x M5x10mm screws, 1 x M5x30mm screw, 6 x M5 nuts, 3 x M5 T Nuts and 11 x M5 washers.
ebay seller warm_tech, the screws, nuts and washers were all from Orbital fasteners, and the T-nuts were $7.50 (£4.85) for 100 from robotdigg.
This makes the total cost (6 x 0.161) + (5 x 0.0484) + (3 x 0.0394) + 0.0697 + (6 x 0.0041) + (3 x 0.0485) + (11 x 0.0041) = £1.61 ($2.50).
These were then installed on the top of the frame and adjusted to fit one of my spools of filament.
5mm will be cheaper at half the price, but also half the rigidity.
I have designed some end stops for use with my hall effect sensors and magnets in Sketchup.
The slot for the hall effect sensor curves upwards towards the rear to help the pins exit the hole.
Here are the end stops hot off the printer.
The 3 end stops used 1572mm of filament for a total cost of £0.06.
Here is one with the hall effect sensor installed and held in place with some blue tac.
View from underneath.
I have two sets of very sharp, precision ground HSS metric drills, from Chronos in 0.1mm increments covering 1-6mm and 6-10mm respectively. I use these whenever I require a very sharp or accurate drill, most of the rest of the time I use a more generic set of drills.
The hall effect sensors were $4.00 (£2.58) for 10 from ebay seller gc_supermarket, the M4 T-nuts were $7.50 (£4.85) for 100 from robotdigg, and the countersunk M4 screws actually came with hinges I bought for my laser cutter where I used some slightly longer screws instead, so these were effectively free.
The total cost for the completed endstops is therefore 0.06 + (3 x 0.258) + (3 x 0.0485) = £0.882 ($1.35).
Here are some coils of wire I made up for the endstops, they are each about a metre long and are made from 3 cores of a 50m reel of 6 core alarm cable I bought from Wickes for £12.49 ($19.35) back when I was building my Prusa I3, so about £0.25 each.
I tend to leave the outer protective sleeve on for the 4 core motor wires, but twist any signal wires to help avoid any cross talk interference, should the signal wires need to run together with the motor wires.