Michael's Calibration Matrix
Description
This is a validation / calibration matrix to rule them all. It builds upon the famous examples and tries to improve on them and combine the different strengths. It contains exposure-triangles - like the Phrozen validation matrix; cones supported by differently sized supports - like Tableflips's Cones of Calibration; checkerboard, depth features and slits - like Ameralab's Town and a whole lot more. It uniquely contains two breakout parts: a 3 mm ID tube that fits onto a protruding 3 mm cylinder and an M3 nut - which may fit the M3 screw next to it - depending on printer resolution and exposure. Here are the features explained: - All important feature dimensions are marked on the part! All features have meaningful metric dimensions. Deviations are immediately obvious. - For simple resolution and exposure test - just stop the print after 1 - 1.5 mm and save time! - XY-resolution combs and 45° tilted comb. - Calibration cones: only the right most cone should fail mid-print for perfect exposure. The supports of the cones are 0.4 mm to 0.2 mm - the cone base is 3 mm. Depending on which cone still prints, you know how much area can safely be supported by which type of support contact diameter. For 0.25 mm the supported area is more than 100 x the support cross-section! - Positive and negative text in different sizes. - 3 exposure triangles - the bottom one should be almost closed for correct bottom layer setting. The other two should have the tips of all three triangles touching in one point for perfect exposure. - Half-sphere and full 2 mm sphere to check aliasing and layer lines. The 2 mm sphere also helps in judging bleed-through. - 2 mm thickness arch at the edge of the matrix to measure bleed through. The arch should be as round as possible at the highest point. Z-direction thickness exceeding the XY direction thickness hints at overexposure or bleedthrough. - A sloped ramp that results in steps that are about 20x the layer height - to check correct layer height and later ID which layer height was used in a particular print - Free-standing exposure test next to the cones of calibration: a small rectangular pillar meets the cone frame in exactly one point. Underexposure leaves a gap, overexposure melts them together. - 180° flat overhang to judge layer rigidity at the cone frame - 1 mm and 0.5 mm Z-direction checkerboard - 45° pillars next to checkerboard to test printability of thin angled features (at least 0.5 and 0.4 mm pillars should be visible). - Slits in solid part next to checker board. Vertical slits show resolution / exposure, horizontal slits show bleed through. - Horizontal holes in cone frame - checks bleed through and roundness / resolution. - Long feature to check shrinkage (25 x 5 mm block) with holes to check negative feature resolution. Corresponding cylinders next to it for positive feature sizes. The 3 mm cylinder serves to receive the 3 mm ID tube. If exposure is perfect, they fit exactly. Overexposure - tight fit, underexposure - lose fit. - Stacked cylinders forming porous substance to check resin cleaning success - depending on viscosity and cleaning success, uncured resin will be visible here. - Height check next to bleed through arch - one step tests absolute height from base plate, the second one incremental height from the first step. If the lower step is not 2 mm high (1.5 mm step height + 0.5 mm base height), the base plate is not leveled correctly or not homed correctly. - M3 thread and nut - check how much more additional thread-cutting is required (and possible) to make M3 nuts / threads fit. If exposure and resolution is perfect, they might already fit onto each other, but don't count on it! Usually bleed through misshapes the threads too much. - 45° angle to check aliasing. - tilted "tomb stones" to estimate allowable overhang for 1 mm thick slabs. - Outer dimensions are 50x50 mm with a 1.5 mm rim - check accuracy of the printer and shrinkage from post-curing. - Overhang of the rim to make release from build-plate easy and avoid elephant foot masking accuracy of outer dimensions.
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