Create rockers.md

docs/level_h/rockers.md

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+# Rockers
+The Troodon 2.0 Pro is a large and heavy printer. Getting into the electronics bay requires accessing the underside of the printer, and removing the bottom panel. 
+So the printer has to be turned on its side or its back. This is no easy task, particularly for one person.
+Unless you've got some rockers in place.
+These allow you to tilt the printer onto its back much more easily, while also not damaging the cables coming out of the back of the printer.
+
+## Step 1: Pickup some hardware
+
+The rockers have been sized to work with M4 SHCS screws (BHCS work too) and M4 T-Nuts. The Troodon ships with M3 and M5 T-Nuts so the leftovers won't work here. YOu'll need the following.
+
+- Qty 10: M4 T-Nuts
+- Qty 6: M4 16mm SHCS - for the back
+- Qty 4: M4 10mm SHCS - for the sides (I used 12mm without a problem)
+
+## Step 2: Print the rockers
+
+These are available on Printables:<br/>
+https://www.printables.com/model/629765-troodon-20-rocker-feet
+
+They can be printed in PLA or something similarly strong like ASA or ABS. If you want to print them in a different color and want to print matching corner trim pieces for the front, you can find those on Printables as well:<br/>
+https://www.printables.com/model/949381-troodon-20-corners
+
+Here's what they look like in red ASA. They feel incredibly strong!
+
+<img width=500 src=https://github.com/user-attachments/assets/faf370c2-0c9b-47b3-9bee-a935278028a8>
+
+## Step #3: Prepare the printer
+
+The main challenge here is that the bottom screws for the back panel are M3 screws that need to be replaced with larger M4 screws, so the T-Nuts need to be replaced and larger holes for the M4 screws need to be made. 
+
+- Remove back panel
+- Slide the bottom T-Nuts out of the way
+- Fit the back panel and fit the rockers in place
+- Drill the larger holes through the rocker so they are in the right place
+
+## Step #4: Fun with T-Nuts
+
+Here we're just adding 10 T-Nuts to the existing 2020 aluminum extrusions. Here are some tips for handling T-Nuts.
+
+- Use a small but sturdy allen key that can fit inside the M4 hole
+- Make sure the ball bearing in the T-Nut is springy - no good if it is stuck
+- Place the T-Nut into the 2020 slot sideways, and then use the allen key to lock it into place
+- With a little luck, this won't take any force at all
+- With a little more luck, they'll stay right where you place them and not drop
+- They should be able to be pushed up or down using the allen key
+
+## Step #5: Finishing up
+- With all of the T-Nuts roughly positioned, fit the rocker into position
+- Use the allen key to precisely position each of the t-nuts into their final spots
+- Replace the back panel, leaving off the bottom screw on either side
+- The enlarged holes should be aligned with the T-Nuts in those locations
+- Screw in the 16mm screws at the back (3 on each side)
+- Screw in the 10mm (or 12mm) screws on the sides (two on each side)
+
+<img width=500 src=https://github.com/user-attachments/assets/71796821-c8aa-49ac-aeb3-e730406e459f>
+
+