adjust sparkmaker config. remove github sponsors link from homepage. fix source code rendering in print css.

input/index.md

 
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 ### Recent Posts and Updates
 
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input/projects/3d-printing/sparkmaker_repair.md

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 The most important changes need to happen in the Printer Settings.
-There you need to adjust the display size to 854x480, the display size to 99.82x56.10mm, maximum height to 120mm, the orientation to landscape and disable all mirroring.
+There you need to adjust the display size to 854x480, the display size to 98.57x54.99mm, maximum height to 120mm, the orientation to landscape and disable all mirroring.
 
 In the Material Settings I recommend setting the exposure time to 15s and the initial exposure time to 120s.
 But this may change depending on the resin you plan to use.
     101.854mm * 0.98 = 99.81692mm
     57.248mm * 0.98 = 56.10304mm
 
-I'm sure these numbers are still not totally exact, but they seem to be close enough for my purposes.
+With these I printed another calibration cube, this time with 20mm, to be able to measure it with more accuracy.
+Now I got these correction factors, as the cube was still a little bit too small.
 
-You can also [download my PrusaSlicer configuration for the Sparkmaker](files/config_sparkmaker.ini) or even for [all of my printers](files/PrusaSlicer_config_bundle.ini), if you're so inclined.
+    99.8169mm * 0.9875 = 98.56918875mm
+    56.103mm * 0.99 = 55.54197mm
+
+Now the X axis measured spot-on at 20mm, but the Y axis still only gave 19.8mm.
+So I corrected it again.
+
+    55.54197mm * 0.99 = 54.9865503mm
+
+To be honest, I'm not sure why this calibration took so many attempts, or what I'm doing wrong.
+I'm also sure these numbers are still not totally exact, but they seem to be close enough for my purposes.
+
+For the Z axis I arrived at a correction factor of 0.995, which can be set in PrusaSlicer as "Printer scaling correction Z".
+
+You can [download my PrusaSlicer configuration for the Sparkmaker](files/config_sparkmaker.ini) or even for [all of my printers](files/PrusaSlicer_config_bundle.ini), if you're so inclined.
 
 As a test I printed [this model](https://www.printables.com/model/296411-metal-gear-mk-ii-from-game-metal-gear-solid-4), scaled down to 50% with a layer height of 0.1mm.
 This took about 3½ hours.
 
 <!--%
 lightgallery([
+    [ "img/sparkmaker_30.jpg", "Calibration cubes in 5mm, 10mm and 20mm" ],
     [ "img/sparkmaker_21.jpg", "Small Metal Gear Mk. II figurine" ],
 ])
 %-->

static/css/print.css

     border-radius: 10px;
 }
 
-pre {
+._sh {
     max-height: 100%;
     font-size: 0.9em;
     padding: 10px;

static/files/PrusaSlicer_config_bundle.ini

 area_fill = 50
 bed_custom_model = 
 bed_custom_texture = 
-bed_shape = 0x0,99.8169x0,99.8169x56.103,0x56.103
+bed_shape = 0x0,99.8169x0,99.8169x54.987,0x54.987
 default_sla_material_profile = Prusa Orange Tough @0.05
 default_sla_print_profile = 0.05 Normal
-display_height = 56.103
+display_height = 54.987
 display_mirror_x = 0
 display_mirror_y = 0
 display_orientation = landscape

static/files/config_sparkmaker.ini

 area_fill = 50
 bed_custom_model = 
 bed_custom_texture = 
-bed_shape = 0x0,99.8169x0,99.8169x56.103,0x56.103
+bed_shape = 0x0,99.8169x0,99.8169x54.986,0x54.986
 bottle_cost = 0
 bottle_volume = 1000
 bottle_weight = 1
 compatible_prints_condition_cummulative = "layer_height == 0.1"
 default_sla_material_profile = Prusa Orange Tough @0.05
 default_sla_print_profile = 0.05 Normal
-display_height = 56.103
+display_height = 54.986
 display_mirror_x = 0
 display_mirror_y = 0
 display_orientation = landscape