You may want to change from rods in your new carriages to new hardened steel shafts. Tighter tolerances on those, rods have a tendency to have a slight curve or bend in them.

I've got pointers to all my SD2 mods on my own web page at: http://home.comcast.net/~tomhorsley/har … -mods.html

Your webpage is one of the best around, already been reading it before even starting this, I'm gonna mod my SD4 until my hands fall off, so your web page will be more than useful.m gonna start writing the first mod today, which will be Lawsy's MK5 Extruder, after i get back from work

BTW, if you find any spelling mistake, please notify me, im still fine tunning my English
Thanks in advance

currently have printed out the lawsey carriages am going to add an e3d hot end and am seriously considering doing the direct drive modification all i need for that is a longer rod

i'm even going to paint the case originally i thought hammered iron but im reconsidering going with a bronze look

I've recently purchased an SD4, and I always liked to tinker with everything I can get, so I started searching for modifications, upgrades, etc.But I noticed they are all scattered around the forum. That isn't convenient for anyone, so I decided that while I'm waiting for my printer, I'm gonna search for all the topics that have instructions to make the upgrades. It will be a diagram that will have diverse color codes representing difficulty and arrows will represent for what model the upgrade applies and if additional steps are required, it will be showing what previous Upgrades/Modifications that are needed for the next one.I will be adding as much as I can to the thread, but I know there are several people here with more knowledge about this than me, so everybody is invited to submit suggestions/ideas/information or whatever they think should be added. Support for the workbench, Workbench Apprentice, and the press will be added later when the first 3 printers are finished:

+++++++++++++++++++++++++ Lawsy’s MK5 Extruder +++++++++++++++++++++++++++++
Author: Lawsy (http://www.soliforum.com/user/51/)
Files: (http://www.thingiverse.com/thing:111213/#files)
Lawsy’s Extruders have been a community favorite since they were released, making the stock feel inferior in many ways. The fifth iteration of it is no difference. With a sturdier tension arm and contra measures to prevent any kind of wobble, this extruder is the most used in the Solidoodle community. It is a simple upgrade most of the members will be able to perform easily and quickly.
++++++ Materials ++++++
2x M3 x 10mm
1x M3 x 16mm
Original parts from jigsaw extruder
STL Files
++++++ Materials ++++++
Step One:

Print the STLs at Maximum infill.
Step Two:

Take out the supports and sand if needed
Step Three:

The locking arm of the extruder should be fitted and held in place by an M3 x 10mm bolt.
Step Four:

Use the old parts from the Jigsaw extruder (bolts, washers and the bearing). Place one washer in front of the bearing and three in the back. Use the M3 x 16mm bolt to secure the tension arm to the extruder body
Step Five:

Use the M3 bolts from the Jigsaw to secure the body to the carriage. Insert the hot end into the extruder.
Step Six:

Attach the stepper motor to the extruder using four M3 bolts. The left piece should be attached used an M3 X10mm.Use some M3 bolts to attach the underneath body piece to hit the end stops.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++