If you have a 3D printer it's a really easy project to make and a quick stable solution, this project was originally made as a motorized slider but for now this just the simple version.

what do you need to make it?

3D printer
12 mm metal rod (x2)
12 mm slider bearing (x4)
M6,24mm screws (x4)
M4,30 mm (x16)
M3,7mm (x4)
M2.5,14 mm (x4)
M6 nuts (x4)
M4 nuts (x16)
M3 nuts(x4)
M2.5 nuts(x4)
camera mount

STL files available on cults3d

https://cults3d.com/en/3d-model/tool/camera-slider-yehia

Step 1: 3D Print Everything BUT Read the Instruction

you will find all the parts needed on Thingiverse and Cults3d

you must be careful about how you put your supports and make sure that your bed is leveled correctly.

Important NOTE

the plate is printed in two stages.

you have to print it until it reaches 6mm then you put the M4 nuts and then you continue the print the way the nuts will be embedded inside the plate.

Step 2: Assemble the Legs

remove the supports and use the M2.5*14mm screws and put the nuts in their holes.

Step 3: Assemble the Plate

Use the M4*30 mm screws and put the bearings in the right place

Step 4: Take a Look at Your Cat (it Helps)

Step 5: Assemble the Knobs

Use the M6*24mm screws

Step 6: Put the Nuts in There Right Places

use the M3 and M6 nuts and put them in the right places

Step 7: Slide the Metal Rods in the Plate

Step 8: Assemble the Sides

just put the legs in the holes made for them and make sure that the gears go inside the corresponding places, then put the knobs and tighten them.

Step 9: Assemble the Slider

put the 12mm rods and make sure they are completely inside the hole then use the M3*7mm to secure the rods to the sides and make sure they are tightened very well.